<?php
header("Content-Type: text/html;charset=utf-8");
class a implements JsonSerializable{
public $b1 = 1;
private $b2 = 2;
protected $b3 = 3;
// 实现的抽象类方法，指定需要被序列化JSON的数据
public function jsonSerialize() {
$data = [];
foreach ($this as $key=>$val){
$data[$key] = $val;
}
return $data;
}
}
$json = json_encode(new a);
echo $json;官网文档地址： https://php.net/manual/en/class.jsonserializable.php
